N.J. Stat. Ann. § 39:3-27.34

2. The Chief Administrator of the New Jersey Motor Vehicle Commission shall promulgate rules and regulations governing the issuance and use of these registration plates and providing for their surrender by persons who: cease to be members of a military reserve unit and have completed less than six years of service with the military reserve unit; cease to be residents of this State; or are discharged from service other than by means of an honorable discharge or under general honorable conditions.